Chair frame



FIG. 1 is a perspective view of a chair frame showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is an exploded perspective view of thereof in an environment showing other chair frames.

The broken lines showing additional chair frames in FIG. 8 represent are environmental and form no part of the claimed design. All other broken lines show portions of a chair frame that form no part of the claimed design. 

CLAIM The ornamental design for a chair frame, as shown and described. 